Air sealing services in Norwalk CA - hidden leaks found and closed first
Hot upstairs or drafty rooms? We find where air slips through your house and seal it, so rooms hold the temperature you set.
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Do you need a pro to seal the air leaks in your house?
Air sealing services in Norwalk, CA close the cracks, holes and gaps that let outside air into your house and let cooled or heated air leak out, which insulation by itself may not stop. Our crew seals those openings, usually starting in the attic, so the rooms below stay closer to the temperature you set.
Most people call because the upstairs is hot by afternoon, the room over the garage never feels right, or the insulation in the attic has gone gray, which usually means air has been moving through it and dragging dust along. The price turns on how many openings there are, how much insulation we have to pull back to reach them, and whether new insulation or insulation removal goes with the job. The schedule mostly turns on whether a roof leak, old wiring or an appliance has to be fixed by another trade first, and my written estimate lays all of that out in the order I'd do it.
What our air sealing service covers
The leaks that matter most are usually the ones you can't see, buried under attic insulation where the walls meet the attic floor, so I look for them before we seal anything instead of guessing. I also check the attic for anything that has to be dealt with first, like a roof leak, a bath fan blowing into the attic, old knob-and-tube wiring that's still live or a gas fireplace, because sealing over those just hides them. Then our installers pull back or scoop out insulation where it's in the way and close the gaps around can lights, pipes, wires, the hatch and the tops of the walls with caulk or spray foam, keeping the eave vents clear so the attic can still breathe. Once your house is tighter, I go over fresh air and any fuel-burning appliances with you, and if the house needs one, I bring in an HVAC pro rather than guess at it.
For most attics, sealing the gaps and topping up blown-in insulation, which is loose fill blown through a hose, gives you the most for the money. Closed-cell foam insulation, a dense foam that seals air and blocks moisture while it insulates, costs more, and I only steer people toward it when the ductwork runs through the attic. If you've got a cellar or a room below grade, basement insulation takes care of the walls down there once the gaps upstairs are closed.
What air sealing services run into in Norwalk homes
Norwalk grew up as a post-war suburb, with compact lots and block after block of single-family houses, and in houses like that we usually find the same leaks around original light fixtures, plumbing and wiring runs, the attic hatch and the wall shared with an attached garage. Knowing that tells me where to look first, but I still go through every attic, because years of remodels, rewiring and roof patches mean no two are left the way they were built. We see the same kinds of houses on jobs in Downey and Bellflower.
California's energy code splits the state into climate zones and sets its efficiency minimums zone by zone, so what a job has to meet depends on where the house sits. We're based in Norwalk and work across the cities around it in southeast Los Angeles County and north Orange County, and we go by your address instead of carrying a rule over from somewhere else.
- Call (562) 307-9042
- Mon–Fri: 6 AM–11 PM, Sat–Sun: 7 AM–11 PM
- Norwalk, CA 90650
What happens when you call us about air sealing in Norwalk?
Call us or send the form
Call (562) 307-9042 or use the form, and we'll set up a time to come look. Landlords and property managers can tell us how to reach tenants, and we'll keep them in the loop.
I inspect and write the plan
I come out myself and check the attic, crawl space or walls for leaks, old wiring, gas appliances and anything else that has to be fixed first. You get a written estimate that lists the work in the order it should happen, so you see the price and the plan before anyone starts.
Our installers seal the house
Once you say go, we take care of any permit the job needs, and our installers do the sealing with me checking in along the way. If another trade has to fix something first, that's already on your plan ahead of us.
We clean up and explain
We clean up the attic and anything we came through on the way in. Then I walk you through what we sealed and where.
Why Norwalk homeowners call Precision Norwalk Insulation Services for air sealing
I do every estimate myself
I come out to look at your house and write the estimate myself, and our installers do the work with me checking in along the way. The person who found the leaks is the same one making sure they get closed.
What's underneath gets fixed first
We've been in business since 2023. Before that I spent years keeping rental houses and apartments in working order for a property management company, and I saw plenty of attics where insulation had been blown over a roof leak or a bad vent. That's why I'll tell you to fix something first before I'll sell you work that won't hold up.
Fully licensed and insured
California's state licensing board only lets someone work without a license on minor jobs up to $1,000, and only when the job needs no permit and they employ no one. If a quote for your attic runs past that, ask whoever's bidding for their license before they start.
On air sealing, what counts is finding the leaks you can't see before anything gets covered up, so book a visit and I'll go through the attic with you. Satisfaction guaranteed on every job.
Request an estimateGet a written air sealing plan for your house
Send the form and expect a reply within 1 business day to set up a free in-person estimate, with no pressure and no obligation. I come out myself, look over the attic, crawl space and walls, and hand you a written plan that lists what I'd do and in what order.
- Fully licensed and insured.
- Phone
- (562) 307-9042
- Location
- Norwalk, CA 90650
- Hours
- Mon–Fri: 6 AM–11 PM, Sat–Sun: 7 AM–11 PM
Questions about air sealing in Norwalk
Can I seal air leaks in my Norwalk house myself?
Yes, for the obvious ones, like gaps around door frames and where pipes, vents and wires come through the wall. Sealing by hand tends to miss the small, hard-to-find leaks, especially in an attic buried under layers of insulation, and a house with hidden leaks like that needs a pro to find them.
How do I find hidden air leaks in my house?
Pros find them with a blower door test, which pulls air through the house so the leaks show, and an infrared camera that picks up the temperature change at each gap, so you know where sealing will help before any work starts. BPI's standard for its certified pros calls for a blower door test before and after sealing, which shows you how much the work improved the house.
Should air sealing come before or after new attic insulation?
Air sealing comes first, because sealing before you insulate gets the most out of both jobs. If you're adding attic insulation, plan the sealing as the first step of that same project instead of a separate visit later.
Does a house need more fresh air after air sealing?
It might, because once the leaks are closed, some houses need a fan system added to bring in fresh air. Without enough ventilation, moisture and harmful gases can build up, and a gas furnace or water heater short on oxygen can give off carbon monoxide, which is why we go over it with you after the work.
What does attic air sealing cost around Los Angeles?
In the Los Angeles area, attic air sealing done before new insulation usually runs about $350 to $2,300 per job. That's the area's typical range, not our price, and where your house lands depends on how many gaps there are and what has to be fixed first, which your written estimate spells out.
What is the best way to handle vermiculite insulation before air sealing?
Have it tested first, because the Department of Energy's attic guide says vermiculite may contain asbestos and has to be tested before the attic is sealed and insulated. It looks like small gray-brown pebbles, and if I see it in your attic, we won't seal or insulate over it until the test comes back.
Other work that often goes with air sealing
Basement insulation
Worth a look if you have a cellar or a room below grade that stays cold and damp after the rest of the house is tight.
Closed-cell foam insulation
Seals and insulates in one pass, and earns its higher price when your ductwork runs through the attic.
Get your hidden air leaks found first
If you have gas appliances or old pebbly insulation in the attic, mention it when you call or send the form, so I come out ready to check them.
Request an estimateCall (562) 307-9042